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arXiv 1402.4701cond-mat.str-el
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连续的3d和4f磁性:对YbFe2Al10中强关联的3d电子

Contiguous 3d and 4f magnetism: towards strongly correlated 3d electrons in YbFe2Al10

P. Khuntia, P. Peratheepan, A. Strydom, Y. Utsumi, K. -T. Ko, K. -D. Tsuei, L. H. Tjeng, F. Steglich, M. Baenitz

摘要:

我们目前的磁化强度,比热,和27铝核磁共振研究YbFe 2 Al 10在很宽的温度范围和磁场。低温磁化率在弱磁场下强烈增强,同时伴随着零磁场下低温比热系数的ln(T0/T)发散,表明关联电子处于基态.从我们的硬X射线光电子能谱(HAXPES)的研究,在50 K的Yb价被评估为2.38。该系统显示在低到中温范围内的价态波动行为,而在400 K以上,Yb 3+进行完整和稳定的时刻,和Fe进行约3.1 mB的时刻。索末菲-威尔逊比的增强值和自旋-晶格弛豫速率除以T [27(1/T1 T)]与静态磁化率的动态标度表明混合铁磁相关性。27(1/T1 T)同时跟踪了高温下4f-Yb离子的价态涨落和低温下部分近藤屏蔽Fe 3d磁矩间的场依赖反铁磁关联,后者是从Yb 4f混合导带演化出来的.

英文摘要:

We present magnetization, specific heat, and 27Al NMR investigations on YbFe2Al10 over a wide range in temperature and magnetic field. The magnetic susceptibility at low temperatures is strongly enhanced at weak magnetic fields, accompanied by a ln(T0/T) divergence of the low-T specific heat coefficient in zero field, which indicates a ground state of correlated electrons. From our hard X-ray photo emission spectroscopy (HAXPES) study, the Yb valence at 50 K is evaluated to be 2.38. The system displays valence fluctuating behavior in the low to intermediate temperature range, whereas above 400 K, Yb3+ carries a full and stable moment, and Fe carries a moment of about 3.1 mB. The enhanced value of the Sommerfeld Wilson ratio and the dynamic scaling of spin-lattice relaxation rate divided by T [27(1/T1T)] with static susceptibility suggests admixed ferromagnetic correlations. 27(1/T1T) simultaneously tracks the valence fluctuations from the 4f -Yb ions in the high temperature range and field dependent antiferromagnetic correlations among partially Kondo screened Fe 3d moments at low temperature, the latter evolve out of an Yb 4f admixed conduction band.

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